Salt-containing wastewater reduced-pressure evaporative crystallization device

Abstract

The utility model provides a salt-containing wastewater reduced-pressure evaporative crystallization device which comprises an evaporative crystallizer connected with a condenser. The condenser is connected with the vacuum pump and the evaporation condensation water tank; and the evaporation condensation water tank is connected with the 1 # evaporation condensation water pump and the 2 # evaporation condensation water pump which are connected in parallel. The method comprises the following steps: performing low-temperature evaporative crystallization on salt-containing wastewater by adopting a reduced pressure evaporator, and drying to generate evaporated condensate water and byproduct salt; evaporative condensate water can be recycled to production as clean return water, so that the recycling of production wastewater is realized, and the purposes of saving water and recycling resources are achieved.

Description

Technical Field

[0001] The utility model belongs to the field of saline wastewater treatment, and in particular relates to a saline wastewater reduced pressure evaporation crystallization device. Background Art

[0002] In the chemical industry, a large amount of high-salt wastewater is generated in the production processes of petrochemicals, coal chemicals, fine chemicals, medicines, printing and dyeing, papermaking and pesticides. When common evaporation crystallization or incineration devices are used for treatment, the operating cost is high and the wastewater generated cannot be recycled, resulting in a waste of resources. Therefore, it is necessary to design a new wastewater discharge system to achieve the reuse of wastewater and reduce environmental pressure. The purpose of this patent is to treat saline wastewater to produce by-product salt and evaporated condensed water. The by-product salt is sold or outsourced for treatment, and the evaporated condensed water is reused as clean water in production, so as to achieve the reuse of production wastewater, save water and reuse resources, which is of great significance to energy conservation and consumption reduction of enterprises and to improve their core competitiveness. Utility Model Content

[0003] The utility model provides a salt-containing wastewater reduced pressure evaporation crystallization device, comprising an evaporation crystallizer, the evaporation crystallizer is connected to a condenser; the condenser is connected to a vacuum pump and an evaporation condensation water tank; the evaporation condensation water tank is connected to a 1# evaporation condensation water pump and a 2# evaporation condensation water pump.

[0004] The evaporation crystallizer is provided with a salt-containing wastewater inlet, a cleaning water inlet, and a steam outlet from left to right on the top, and a solid discharge port on the bottom.

[0005] The evaporation crystallizer is provided with a rotatable spiral blade inside to push the material to the solid discharge port for discharge, thereby achieving crystallization separation.

[0006] An evaporation crystallizer jacket is arranged outside the evaporation crystallizer, and a fresh steam inlet and a steam condensed water outlet are arranged at the bottom of the evaporation crystallizer jacket.

[0007] The evaporation crystallizer is provided with liquid level, temperature and pressure detection to form liquid level, temperature and pressure detection interlocking control.

[0008] A condenser non-condensable gas outlet and a condenser condensed water outlet are arranged at the lower side of the condenser. The condenser non-condensable gas outlet is above the condenser condensed water outlet. The condenser non-condensable gas outlet is connected to a vacuum pump, and the condenser condensed water outlet is connected to an evaporative condensed water tank. A circulating water inlet and outlet are arranged at the bottom of the condenser.

[0009] The 1# evaporative condensing water pump is connected in parallel with the 2# evaporative condensing water pump.

[0010] The beneficial effects of the utility model are as follows:

[0011] The saline wastewater is evaporated and crystallized at low temperature by a vacuum evaporator, and then dried to produce evaporation condensed water and by-product salt. The evaporation condensed water can be reused as clean return water in production, realizing the reuse of production wastewater, and achieving the purpose of water saving and resource reuse. The vacuum evaporation crystallization process is simple, and evaporation and drying are directly carried out. The products are only by-product salt and evaporation condensed water. Continuous evaporation crystallization or intermittent evaporation crystallization can be selected according to the properties of the saline wastewater inlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the utility model device.

[0013] Markings in the figure: evaporation crystallizer 1, condenser 2, vacuum pump 3, evaporation condensation water tank 4, 1# evaporation condensation water pump 5, 2# evaporation condensation water pump 6, salt wastewater inlet 7, cleaning water inlet 8, fresh steam inlet 9, steam condensation water outlet 10, solid discharge port 11, steam outlet 12, condenser non-condensable gas outlet 13, condenser condensation water outlet 14, evaporation crystallizer jacket 15. DETAILED DESCRIPTION

[0014] The implementation scheme of the utility model will be described in detail below in conjunction with examples. The following examples are only used to illustrate the utility model and should not be regarded as limiting the scope of the utility model.

[0015] Example 1

[0016] A salt-containing wastewater reduced pressure evaporation crystallization device comprises an evaporation crystallizer 1, wherein the evaporation crystallizer 1 is connected to a condenser 2; the condenser 2 is connected to a vacuum pump 3 and an evaporation condensation water tank 4; the evaporation condensation water tank 4 is connected to a 1# evaporation condensation water pump 5 and a 2# evaporation condensation water pump 6.

[0017] The evaporation crystallizer 1 is provided with a salt-containing wastewater inlet 7, a cleaning water inlet 8, and a steam outlet 12 from left to right on the top, and a solid discharge port 11 on the bottom.

[0018] The evaporation crystallizer 1 is provided with a rotatable spiral blade inside to push the material to the solid discharge port 11 for discharge, thereby achieving crystallization separation.

[0019] An evaporation crystallizer jacket 15 is disposed outside the evaporation crystallizer 1 ; a fresh steam inlet 9 and a steam condensed water outlet 10 are disposed at the bottom of the evaporation crystallizer jacket 15 .

[0020] The evaporation crystallizer 1 is provided with liquid level, temperature and pressure detection to form liquid level, temperature and pressure detection interlocking control.

[0021] A condenser non-condensable gas outlet 13 and a condenser condensed water outlet 14 are provided at the lower side of the condenser 2. The condenser non-condensable gas outlet 13 is above the condenser condensed water outlet 14. The condenser non-condensable gas outlet 13 is connected to a vacuum pump 3, and the condenser condensed water outlet 14 is connected to an evaporative condensed water tank 4. A circulating water inlet and outlet are provided at the bottom of the condenser 2.

[0022] The 1# evaporative condensing water pump 5 and the 2# evaporative condensing water pump 6 are connected in parallel.

[0023] Example 2

[0024] Using the device of Example 1, the salt-containing wastewater enters the evaporation crystallizer 1, and the evaporation crystallizer jacket 15 is passed with fresh steam for heating, which is passed through the fresh steam inlet 9, and the washing water is passed through the washing water inlet 8. Start the vacuum pump 3 to maintain the negative pressure in the system below -90kPa, and start evaporation. The crystallized solid salt is pushed to the solid discharge port 11 by the internal rotating spiral blade for discharging and packaging, and the evaporated water vapor is transported to the condenser 2 by the steam outlet 12, and after condensation and liquefaction, it enters the evaporation condensation water tank 4 through the condenser condensation water outlet 14, and then transported to post-processing or directly reused in production through the 1# evaporation condensation water pump 5 or the 2# evaporation condensation water pump 6. Part of the non-condensable gas generated by evaporation is discharged from the condenser non-condensable gas outlet 13 and discharged to the tail gas treatment system through the vacuum pump 3.

Claims

1. A device for reducing pressure evaporation and crystallization of saline wastewater, characterized in that: The invention comprises an evaporation crystallizer (1), wherein the evaporation crystallizer (1) is connected to a condenser (2); the condenser (2) is connected to a vacuum pump (3) and an evaporation condensation water tank (4); and the evaporation condensation water tank (4) is connected to a No. 1 evaporation condensation water pump (5) and a No. 2 evaporation condensation water pump (6).

2. The saline wastewater reduced pressure evaporation crystallization device according to claim 1, characterized in that: The evaporation crystallizer (1) is provided with a salt-containing wastewater inlet (7), a cleaning water inlet (8), and a steam outlet (12) in sequence from left to right on the top, and a solid material discharge port (11) on the bottom.

3. The saline wastewater reduced pressure evaporation crystallization device according to claim 1, characterized in that: The evaporation crystallizer (1) is provided with rotatable spiral blades inside and an evaporation crystallizer jacket (15) outside; the bottom of the evaporation crystallizer jacket (15) is provided with a fresh steam inlet (9) and a steam condensate outlet (10).

4. The saline wastewater reduced pressure evaporation crystallization device according to claim 1, characterized in that: The evaporation crystallizer (1) is provided with liquid level, temperature and pressure detection to form liquid level, temperature and pressure detection interlocking control.

5. The saline wastewater reduced pressure evaporation crystallization device according to claim 1, characterized in that: A condenser non-condensable gas outlet (13) and a condenser condensate outlet (14) are provided at a lower position on the side of the condenser (2); the condenser non-condensable gas outlet (13) is above the condenser condensate outlet (14); the condenser non-condensable gas outlet (13) is connected to a vacuum pump (3); and the condenser condensate outlet (14) is connected to an evaporative condensate tank (4); and a circulating water inlet and outlet are provided at the bottom of the condenser (2).

6. The saline wastewater reduced pressure evaporation crystallization device according to claim 1, characterized in that: The 1# evaporative condensing water pump (5) is connected in parallel with the 2# evaporative condensing water pump (6).

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